20 - 4
20.1 GOT Restoration Sheet
(2) Status of the GOT when it freezes (screen operation stopped)
(3) Status of the PLC CPU
Phenomenon Cause/status Action
(a) Switching to the utility
Enabled
Error code (system alarm):
( )
Example: 460 Communication unit error
When the system alarm display
function can be used, take the action
for the error code (system alarm)
displayed.
If the action cannot be taken,
proceed to (2)-(b).
Disabled
The system alarm display function cannot
be used.
Proceed to (2)-(c).
(b) Executing of I/O check from the GOT utility
Communication error
Display details:
( )
Example: A message indicating the cause
may be a connection error was
displayed.
Proceed to (2)-(c).
No error
The hardware such as a communication
interface has no error.
Proceed to (3) Status of the PLC
CPU.
(c) Objects not displayed on the monitor screen
Found
Details:
( )
Example: The numerical display object is
not displayed.
Proceed to (3) Status of the PLC
CPU.
Not found
Phenomenon Cause/status Action
(a) PLC failure
Occurs always.
An error such as CONTROL-BUS. ERROR
or SP. UNIT LAY. ERROR may have
occurred.
Error code (system alarm):
( )
Example: 1204 CPU H/W fault
Proceed to the following.
20.2 Troubleshooting in Bus
Connection
Occurs sometimes.
The PLC CPU may be influenced by noise
or the hardware may be faulty.
Occurrence frequency:
( )
Example: Once a month
Error code (system alarm):
( )
Example: 1204 CPU H/W fault
Proceed to (4) GOT restoration
procedure.
Operates normally.
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